EP 0181943 A4 19880627 - DATA-HOLDING CIRCUIT IN A MEMORY.
Title (en)
DATA-HOLDING CIRCUIT IN A MEMORY.
Title (de)
DATENHALTESCHALTUNG IN EINEM SPEICHER.
Title (fr)
CIRCUIT DE MAINTIEN DE DONNEES DANS UNE MEMOIRE.
Publication
Application
Priority
JP 9418884 A 19840511
Abstract (en)
[origin: WO8505475A1] The invention is to reliably hold the contents stored in a memory even in the power supply interrupt while the memory is being accessed. The circuit of the invention comprises a first detector means (2) which detects the power supply interrupt; a second detector means (7) which detects whether the memory (1) is being accessed or not; a switching means (8) which supplies current from a back-up power supply (3) to the memory (1) only when the power supply interrupt has been detected by the first detector means (2) and the memory (1) that has not been accessed is detected by the second detector means (7); and access inhibit means (5, 7) which inhibit access to the memory (1) only when the power supply interrupt has been detected by the first detector means (2) and the memory that has not been accessed is detected by the second detector means (7); so that access to the memory (1) will not be discontinued before it has been completed.
IPC 1-7
IPC 8 full level
H02J 1/00 (2006.01); G06F 1/26 (2006.01); G06F 1/30 (2006.01)
CPC (source: EP US)
G06F 1/30 (2013.01 - EP US)
Citation (search report)
- [Y] WO 8102362 A1 19810820 - MOSTEK CORP [US]
- [Y] US 4381552 A 19830426 - NOCILINI JOHN D, et al
- [A] US 4388706 A 19830614 - BUTLER CLYDE R
- See also references of WO 8505475A1
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
WO 8505475 A1 19851205; EP 0181943 A1 19860528; EP 0181943 A4 19880627; JP S60238920 A 19851127; US 4669066 A 19870526
DOCDB simple family (application)
JP 8500265 W 19850510; EP 85902166 A 19850510; JP 9418884 A 19840511; US 81612285 A 19851231